Everyone experiences sadness in normal course of life, but if this state persists for a longer duration it is termed as depression. It is commonly characterized by feelings of sadness, helplessness, restlessness, etc. It results in lower concentration, trouble in decision making, loss of appetite, guilt, etc. This book brings forth some of the most innovative concepts and elucidates the unexplored aspects of depression. The aim of this text to facilitate a better understanding of this disorder through case studies compiled from across the globe. Different approaches, evaluations, methodologies and advanced studies on diagnosis, treatment and management of depression have been included in this book. It is a vital tool for all researching and studying this field.